Coal byproducts from Muskingum River Power Plant, a now-defunct coal power plant in Ohio, might have contained forms of these radioactive particles. When coal burns at power plants, it produces residual waste, or coal ash, including a fine silicon powder called fly ash. Commercial Liability Partners did not respond to requests for comment, but on its website outlines a cleanup and redevelopment plan that includes closing the coal ash ponds, some by capping, or covering, the coal ash in place. Earthjustice was instrumental in pushing the EPA to establish initial coal ash regulatory procedures in 2010, said Jennifer Cassel, an Earthjustice coal ash project attorney. With long-term effects of coal ash pollution and radioactivity unknown, she said keeping coal ash regulations in check under the current administration is important in Ohio and similar areas with coal ash ponds.